An estimate of tidal energy lost to turbulence at the Hawaiian Ridge
| Type | : | ACL |
|---|---|---|
| Nature | : | Production scientifique |
| Au bénéfice du Laboratoire | : | Non |
| Statut de publication | : | Publié |
| Année de publication | : | 2006 |
| Auteurs (9) | : | KLYMAK Jody,m MOUM James NASH Jonathan KUNZE E GIRTON J,b CARTER G,s LEE C SANFORD Tb GREGG Mc |
| Revue scientifique | : | Journal of Physical Oceanography |
| Volume | : | 36 |
| Fascicule | : | 6 |
| Pages | : | 1148-1164 |
| DOI | : | 10.1175/JPO2885.1 |
| URL | : | - |
| Abstract | : | An integrated analysis of turbulence observations from four unique instrument platforms obtained over the Hawaiian Ridge leads to an assessment of the vertical, cross-ridge, and along-ridge structure of turbulence dissipation rate and diffusivity. The diffusivity near the seafloor was, on average, 15 times that in the midwater column. At 1000-m depth, the diffusivity atop the ridge was 30 times that 10 km off the ridge, decreasing to background oceanic values by 60 km. A weak (factor of 2) spring-neap variation in dissipation was observed. The observations also suggest a kinematic relationship between the energy in the semidiurnal internal tide (E) and the depth-integrated dissipation (D), such that D similar to E-1 +/- 0.5 at sites along the ridge. This kinematic relationship is supported by combining a simple knife-edge model to estimate internal tide generation, with wave-wave interaction time scales to estimate dissipation. The along-ridge kinematic relationship and the observed vertical and cross-ridge structures are used to extrapolate the relatively sparse observations along the length of the ridge, giving an estimate of 3 +/- 1.5 GW of tidal energy lost to turbulence dissipation within 60 km of the ridge. This is roughly 15% of the energy estimated to be lost from the barotropic tide. |
| Mots-clés | : | DISSIPATION; ENERGETICS; FLOW; FLUXES; INTERNAL TIDES |
| Commentaire | : | Times Cited in Web of Science Core Collection: 153 |
| Tags | : | - |
| Fichier attaché | : | - |
| Citation | : |
Klymak JM, Moum J, Nash J, Kunze E, Girton JB, Carter GS, Lee C, Sanford T, Gregg M (2006) An estimate of tidal energy lost to turbulence at the Hawaiian Ridge. J Phys Oceanogr 36: 1148-1164 | doi: 10.1175/JPO2885.1
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